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Production method and device capable of reducing polypropylene ash

A production method and polypropylene technology, applied in the field of polypropylene production, can solve the problems of difficult implementation and low usage of alkyl aluminum, and achieve the effects of low ash content, good effect and low cost

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of alkylaluminum used in this patent is extremely low, only equivalent to 15% of normal operating conditions, which requires particularly high quality raw materials, so it is not easy to implement under industrial conditions

Method used

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  • Production method and device capable of reducing polypropylene ash
  • Production method and device capable of reducing polypropylene ash
  • Production method and device capable of reducing polypropylene ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The concrete production technological process of present embodiment and the improvement to above-mentioned comparative example are as figure 2 shown. The reaction products of alkylaluminum and alkylaluminum with impurities are discharged from the loop reactor in the polymerization section along with a large amount of polypropylene and liquid propylene monomer and then enter the first flash line 1. After the liquid propylene monomer is flash vaporized, it is Gas-solid separation is carried out in tank 2. The reaction product containing polypropylene powder, gaseous propylene monomer, alkylaluminum and alkylaluminum and impurities separated from the flash tank 2 enters the high-pressure washing tower 6 for washing. The polypropylene separated from the flash tank 2 enters the bag filter 3 for low-pressure gas-solid separation (working pressure is 0.06Mpa), the solid phase flows into the downstream steaming and drying process, and the gaseous propylene monomer and system ...

Embodiment 2

[0059] The concrete production technological process of present embodiment and the improvement to above-mentioned comparative example are as figure 2 shown. The reaction products of alkylaluminum and alkylaluminum with impurities are discharged from the loop reactor in the polymerization section along with a large amount of polypropylene and liquid propylene monomer and then enter the first flash line 1. After the liquid propylene monomer is flash vaporized, it is Gas-solid separation is carried out in tank 2. The reaction product containing polypropylene powder, gaseous propylene monomer, alkylaluminum and alkylaluminum and impurities separated from the flash tank 2 enters the high-pressure washing tower 6 (working pressure is 1.8Mpa) for washing. The polypropylene separated from the flash tank 2 enters the bag filter 3 for low-pressure gas-solid separation (working pressure is 0.06Mpa), the solid phase flows into the downstream steaming and drying process, and the gaseous ...

Embodiment 3

[0062] The concrete production technological process of present embodiment and the improvement to above-mentioned comparative example are as figure 2shown. The reaction products of alkylaluminum and alkylaluminum with impurities are discharged from the loop reactor in the polymerization section along with a large amount of polypropylene and liquid propylene monomer and then enter the first flash line 1. After the liquid propylene monomer is flash vaporized, it is Gas-solid separation is carried out in tank 2. The reaction product containing polypropylene powder, gaseous propylene monomer, alkylaluminum and alkylaluminum and impurities separated from the flash tank 2 enters the high-pressure washing tower 6 (working pressure is 1.8Mpa) for washing. The polypropylene separated from the flash tank 2 enters the bag filter 3 for low-pressure gas-solid separation (working pressure is 0.06Mpa), the solid phase flows into the downstream steaming and drying process, and the gaseous p...

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Abstract

The invention discloses a production method and device capable of reducing polypropylene ash. The production method comprises the following steps of 1, preparing polypropylene by a liquid-phase bulk polymerization method so that a material containing polypropylene and a liquid propylene monomer is obtained, 2, vaporizing the liquid propylene monomer in the material to obtain a gaseous propylene monomer, and separating the gaseous propylene monomer and the polypropylene to obtain a material containing the gaseous propylene monomer, 3, separating the material containing the gaseous propylene monomer to obtain a propylene monomer and a residual material, 4, discharging the residual material from a system so that the residual material and polypropylene obtained by the gas-solid separation step are not mixed, and 5, carrying out separation to obtain a propylene monomer recycled in the propylene polymerization reaction of the step 1. The device comprises a polypropylene production device. The polypropylene production device comprises a reaction mechanism, a first flash evaporation mechanism, a degassing mechanism and a separation mechanism. Compared with the prior art, the production method reduces polypropylene product ash content by 10-50%.

Description

technical field [0001] The invention relates to the technical field of polypropylene production, in particular to a production method capable of reducing the ash content of polypropylene and its device; further, it is a production method and device for preparing low-ash polypropylene by using a loop reactor liquid-phase bulk method . Background technique [0002] With the continuous expansion of the application range of polypropylene, high-purity and low-ash polypropylene resin has gradually played a huge role in the fields of electronics, electrical appliances, textiles, and medical treatment, opening up new market areas. For example, the development and application of polypropylene capacitor film has greatly improved the quality and performance of electronic and electrical products. Polypropylene ash refers to the metal and non-metallic compounds remaining after burning the polypropylene sample at a high temperature of 850±25°C, such as TiO 2 , MgO, CaO, Al 2 o 3 and S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F6/28C08F2/01
Inventor 杨芝超刘旸杜亚锋陈江波仝钦宇
Owner CHINA PETROLEUM & CHEM CORP
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